CSS and Images with CodeIgniter

[eluser]Unknown[/eluser]
I've got my css file in a map css in the root directory of my website, i used to following rule in my .htaccess file to load the css file:

RewriteCond $1 !^(index\.php|images|css|robots\.txt)
RewriteRule ^(.*)$ /index.php/$1 [L]

Only adding css to the RewriteCond rule didn't work for me for some reason.

I've changed the .htacces file into:

RewriteCond $1 ^(.+\.css)
RewriteRule ^(.*)$ $1 [L]

RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteRule ^(.*)$ /index.php/$1 [L]

This works fine for me.